I recently heard that you can unhook the wastegate and allow the stock turbo to build more boost. So I tried it and it works instead of maxing out at 14-15 psi it will build to 20 psi but that is when I let off not sure how high it will go but that was at 3000 rpms. I was wondering if this will do any damage to engine or turbo if left this way as long as I don't go over 20 psi. It seems to run smoother and have more power unhooked but maybe that is just my imagination. Will the computer throw a code if left unhooked I plugged the line and capped the actuator for the wastegate.

Adding more air to a relatively stock gas engine will increase power. The ecm will increase the amount of fuel injected to achieve an optimum air/fuel ratio as measured by the 02 sensor(s). In a diesel, adding air will make no difference, as more fuel will not be added. There is no reason to disconnect the wastegate on a relatively stock truck. The only way it would be beneficial is if you have excessive smoke at max boost, or if the wastegate spring/diaphram was weak/damaged, as adding additional air will result in more complete combustion. If you install a chip or tuner you will make more boost as a result of the additional fueling, unhooking the wastegate isn't necessary. If you still feel the need to do so, shorten the wategate actuator by tightening the rod. That will put more preload on the wastegate and make it open at a higher pressure.

If you take one thing away from my rant, be it this. If you want boost, ad more fuel. Disconnecting your wastegate is a waste of time.

you can unhook it though and not cause problems. the truck will automatically defuel itself at 22psi I think unless you get a boost fooler. But, with a stock truck you wont make much more than 20 PSI. you want gauges when you do this to monitor EGTS and boost pressure.

More boost = more dense air, more oxegen, more power... not as much as when you add more fuel also, but if you are compressing the air to 20 psi, over the stock, wastegate controled 15-17 psi, there should be more power coming from the combustion process... Right?

However, I do agree... on a stock truck, it's not going to make a real noticeable diffrence. Add gauges, DIY intake, straight pipe the exhaust, and a DP tuner, and you'll be amazed!

A gasoline has a throttle valve in the intake-it is more critical to get air, and have an ideal air/fuel mixture. Air is important to a diesel as well, but as the intake is free flowing, without restriction, It no longer becomes the limiting factor. It is able to get as much air as it needs for the stock fuel. Increasing the pressure isn't necessarily a good thing if the engine is already burning the fuel completely. The reason you don't make more boost? You don't need it. The only point in adding more boost is to allow for you to burn more fuel, which at stock power levels you don't have. Compressing air via a turbocharger makes it hotter than the ambient air. The more you compress it, the hotter it gets. There is an optimum fuel/air ratio. The only time adding more air is a good thing is if your engine requires it-as in belching black smoke because at that point the amount of fuel injected exceeds the amount of air supplied/required to burn it.

I guess if you want to feel cool because your gauge reads higher than stock, go for it. Or hang out with the honda civic crowd. They think 25 psi of boost is "Da bomb yo". Boost is a measure of restriction in the intake. Ad all the hot air you can, push your turbo outside of its efficiency range, and increase your drive pressure. By all means. You can let all the air out of your tires and drive around too-does that mean you should?

(this is not a personal attack on anyone in particular. Unhook the wastegate if you like, I'm just pointing out it is not beneficial, and can actually be detrimental)

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